The NRDC recently put out this handy two-page summary on food waste. It provides a compact answer to how much we waste, what it costs and what we can do about it.
There’s a little about the environmental impact, but that’s not the main focus. I’m sure that was intentional, to shift the focus elsewhere.
The document is part of the food section of the NRDC’s Smarter Living initiative. From what I’ve seen, the entire section is worth a gander.